- _active : Dune::DebugStreamState
- _tied : Dune::DebugStreamState
- _tied_streams : Dune::DebugStreamState
- current : Dune::DebugStreamState
- first_ : Dune::Pair< T1, TT > , Dune::Pair< T1, Nil >
- second_ : Dune::Pair< T1, TT >
- value : Dune::Gcd< a, b > , Dune::Lcm< m, n >